JP2015222875A - On-vehicle speaker apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle speaker apparatus capable of achieving a higher quality sound in a vehicle cabin by reducing a chattering sound.SOLUTION: An on-vehicle speaker apparatus 1 mounted to an interior member (a ceiling member 2) of a vehicle includes: a speaker 3 with a diaphragm 8; and a frame-like conduction member 4, disposed between the diaphragm and the interior member, transmitting a vibration of the diaphragm to the interior member. At the conduction member 4, fragile parts (slits 18a to 18d) extending in a line-shape so as to communicating an outer peripheral edge part 4b to an inner peripheral edge part 4c are formed.

Description

  The present invention relates to a vehicle-mounted speaker device, and more particularly to a vehicle-mounted speaker device capable of reducing chatter noise and realizing better sound in a vehicle compartment.

  As a conventional vehicle-mounted speaker device, one that is attached to an interior material such as a ceiling material is generally known (see, for example, Patent Document 1). In Patent Document 1, for example, as shown in FIG. 11, a speaker 103 provided with a diaphragm 108, and the vibration of the diaphragm 108 is transmitted to the interior material 102 by being arranged between the diaphragm 108 and the interior material 102. A vehicle-mounted speaker device 101 including a frame-plate-shaped transmission member 104 and a speaker grill 105 covering the output opening 102a of the interior material 102 is disclosed. According to the in-vehicle speaker device 101, the vibration of the diaphragm 108 is efficiently transmitted to the interior material 102 by the transmission member 104. The sound output by the vibration of the interior material 102 and the direct sound output from the speaker 103 realize high-quality sound in the vehicle compartment.

  Further, for example, Patent Document 1 discloses that a speaker 103 including a plurality of magnets 110 and coils 111 arranged along a predetermined arrangement direction P is employed as shown in FIG.

JP 2012-114664 A

  However, in the conventional in-vehicle speaker device 101, since the transmission member 104 has a relatively strong structure, the transmission member 104 does not follow due to complicated vibration of the diaphragm 108 of the speaker 103, that is, a chatter sound (that is, noise). ) May occur.

  Further, since the above-described conventional in-vehicle speaker device 101 employs the specific speaker 103, the amplitude may be increased or decreased on both sides of the coil 111 of the diaphragm 108, and chatter noise is likely to occur. As a factor of the magnitude of the amplitude, for example, it is conceivable that the conductive wire connecting the adjacent coils 111 is arranged to be biased to one side of the diaphragm 108.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide an in-vehicle speaker device that can reduce chatter noise and realize better sound in a vehicle compartment.

In order to solve the above problem, the invention according to claim 1 is an in-vehicle speaker device attached to an interior material of a vehicle, wherein the speaker includes a diaphragm, and between the diaphragm and the interior material. A frame-shaped transmission member that is arranged and transmits the vibration of the diaphragm to the interior material, and the transmission member includes a brittle portion that extends linearly so as to connect the outer peripheral edge portion and the inner peripheral edge portion. The gist is that is formed.
According to a second aspect of the present invention, in the first aspect of the invention, the fragile portion is notched from one edge of the outer peripheral edge and the inner peripheral edge of the transmission member and extends to the other edge. The gist is that it is a slit.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the speaker includes a plurality of magnets and coils arranged along a predetermined arrangement direction, and the transmission member is substantially parallel to the arrangement direction. A plurality of first fragile portions formed on one piece of the pair of pieces so as to extend in a direction substantially perpendicular to the arrangement direction, and the other fragile portion. A plurality of second fragile portions formed extending in a direction substantially orthogonal to the arrangement direction on a piece, and an interval in the arrangement direction of the adjacent first fragile portions; The gist is that the interval in the arrangement direction is different.
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the transmission member and the diaphragm are fixed with a screw, and a nut that engages with the screw is embedded in the transmission member. It is a summary.
The gist of a fifth aspect of the present invention is that, in any of the first to fourth aspects of the present invention, the lateral width of the transmission member is substantially the same as the lateral width of the diaphragm.

According to a vehicle-mounted speaker device of the present invention, a speaker including a diaphragm, and a frame-shaped transmission member that is disposed between the diaphragm and the interior material and transmits vibrations of the diaphragm to the interior material are transmitted. The member is formed with a weakened portion extending linearly so as to connect the outer peripheral edge portion and the inner peripheral edge portion. Thus, by setting a linear weak part in a transmission member, the resonance point of vibration is shifted in the transmission member and chatter noise is reduced. Therefore, better sound can be realized in the vehicle compartment.
In addition, when the fragile portion is a slit that is notched from one edge of the outer peripheral edge and the inner peripheral edge of the transmission member and extends to the other edge, the chatter sound is more reliably generated by the slit. Reduced.
The speaker includes a plurality of magnets and coils arranged along a predetermined arrangement direction, the transmission member includes a pair of pieces, the weakened portion includes a plurality of first weakened portions, and a plurality of first weakened portions. Two fragile portions, and when the interval in the arrangement direction of the adjacent first fragile portions and the interval in the arrangement direction of the adjacent second fragile portions are different, a pair of transmission members The intensity differs between the pieces, and the resonance point is suitably shifted according to the amplitude of the diaphragm of the speaker, and chatter noise is more reliably reduced.
In addition, when the transmission member and the diaphragm are fixed with screws, and a nut that engages with the screw is embedded in the transmission member, the adhesion between the diaphragm and the transmission member is improved, and chattering is performed. Sound is reduced more reliably.
Furthermore, when the lateral width of the transmission member is substantially the same as the lateral width of the diaphragm, chatter noise is more reliably reduced than when the lateral width of the transmission member is larger than the lateral width of the diaphragm.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is the schematic diagram which looked down on the ceiling material with which the vehicle-mounted speaker apparatus which concerns on an Example was attached from the vehicle interior outer side. It is a principal part enlarged view of FIG. It is a disassembled perspective view of the said vehicle-mounted speaker apparatus. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2. It is a top view of the transmission member concerning an example. 6 is an enlarged longitudinal sectional view of FIG. 5, where (a) shows a cross section taken along line aa, (b) shows a cross section taken along line bb, and (c) shows a cross section taken along line cc. It is a sweep test result of the vehicle-mounted speaker apparatus which concerns on an experiment example and a comparative example, (a) shows the sweep test result of Experimental example 1, (b) shows the sweep test result of Comparative example 1. It is a longitudinal cross-sectional view of the vehicle-mounted speaker apparatus which concerns on an experiment example, (a) shows the vehicle-mounted speaker apparatus of Experimental example 2, (b) shows the vehicle-mounted speaker apparatus of Experimental example 3. FIG. It is a sweep test result of the vehicle-mounted speaker apparatus which concerns on an experiment example and a comparative example, (a) shows the sweep test result of the comparative example 2, (b) shows the sweep test result of the experimental example 2, (c) is The sweep test result of Experimental example 3 is shown. It is explanatory drawing for demonstrating the weak part of another form, (a) shows the slit notched from the inner peripheral part, (b) shows the through-hole which is not notched from an edge, (c ) Indicates a groove portion that does not penetrate in the thickness direction. It is a disassembled perspective view of the conventional vehicle-mounted speaker apparatus. It is a disassembled perspective view of the conventional speaker.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<In-vehicle speaker device>
The vehicle-mounted speaker device according to the present embodiment is a vehicle-mounted speaker device (1) attached to a vehicle interior material (2), which includes a speaker (3) including a diaphragm (8), a diaphragm, and an interior material. And a frame-shaped transmission member (4) that transmits vibrations of the diaphragm to the interior material. The transmission member (4) includes an outer peripheral edge portion (4b) and an inner peripheral edge portion (4c). ) Are formed so as to communicate with each other (see FIGS. 1 to 3, 10, etc.). In addition, the above “linear” means an elongated shape like a line in plan view of the fragile portion.

  The “fragile portion” is not particularly limited in shape, number, arrangement, etc. as long as the resonance point of vibration can be shifted by the transmission member. A plurality of the fragile portions are usually arranged so that the transmission member is divided into a plurality of portions. As this weak part, the slit (18a-18d) notched from one edge part of the outer peripheral part (4b) and inner peripheral part (4c) of a transmission member (4) and extending to the other edge part, for example , 18 ′) (see, for example, FIG. 3 and FIG. 10 (a), etc.), and a form (eg, FIG. Etc.), a form (for example, see FIG. 10C, etc.) that is a groove (37) recessed in the thickness direction of the transmission member (4). In addition, as a width (S) of the said weak part, 1-10 mm (preferably 2-6 mm) etc. can be mentioned, for example (for example, refer FIG. 5 etc.).

  As the vehicle-mounted speaker device according to the present embodiment, for example, the speaker (3) includes a plurality of magnets (10) and coils (11) arranged along a predetermined arrangement direction (P), and the transmission member (4) includes a pair of pieces (15a, 15b) extending in a direction substantially parallel to the arrangement direction (P), and the fragile portion is arranged in one of the pair of pieces (15a) in the arrangement direction (P ) And a plurality of first fragile portions (18a) formed so as to extend in a direction substantially orthogonal to the other) and a plurality of first fragile portions (15b) formed so as to extend in a direction substantially orthogonal to the arrangement direction (P). A second fragile portion (18b), and an arrangement direction interval (L1) between adjacent first fragile portions is different from an arrangement direction interval (L2) between adjacent second fragile portions (for example, , See FIG.

  As the vehicle-mounted speaker device according to the present embodiment, for example, the transmission member (4) and the diaphragm (8) are fixed by screws (27), and the transmission member has nuts (28) that mesh with the screws. Can be mentioned (for example, see FIG. 4 and the like). The nut (28) can be insert-molded, for example, when a resin transmission member is molded. Thereby, the adhesiveness of a diaphragm and a transmission member is improved more.

  As an in-vehicle speaker device according to the present embodiment, for example, the width (W1) of the transmission member (4) is substantially the same as the width (W2) of the diaphragm (8) (for example, see FIG. 4 and the like). ). Examples of the width (W1) of the transmission member (4) include 44 to 60 mm (preferably 44 to 54 mm). Moreover, as thickness (t) of a transmission member (4), 1.8-3.5 mm (preferably 2-2.8 mm) etc. can be mentioned, for example.

  As an in-vehicle speaker device according to the present embodiment, for example, an output opening formed in the interior material (2) is formed on the inner peripheral edge (4c) of the transmission member (4) so as to extend toward the vehicle interior side. A standing wall (21) facing or in contact with the side surface of (2a) is provided, and the fragile portion is notched from the outer peripheral edge (4b) of the transmission member (4) and extends to the inner peripheral edge (4c). The form (for example, refer FIG.3, FIG.4 etc.) which is a slit (18a-18d) can be mentioned. Thereby, the standing wall which has the sound shielding function to an interior material by a slit is not parted.

  Examples of the material of the “transmission member” include resins such as polycarbonate (PC), polybutylene terephthalate (PBT), polyamide (PA), and modified polyphenylene ether (m-PPE). Of these, polycarbonate is preferable. This is because the vibration damping rate (loss factor) is low, that is, the vibration transmission is high. Furthermore, it is preferable that a transmission member consists of resin containing fiber materials, such as glass fiber, carbon fiber, and a synthetic fiber. This is because breakage and breakage of the transmission member are suppressed.

  Hereinafter, the present invention will be specifically described with reference to the drawings.

(1) Configuration of In-Vehicle Speaker Device As shown in FIG. 1 and FIG. 2, the in-vehicle speaker device 1 according to the present embodiment is a vehicle ceiling material 2 (illustrated as “interior material” according to the present invention). It is attached to the rear left and right side. Each of these vehicle-mounted speaker devices 1 includes a speaker 3 (also referred to as a “planar speaker”), a transmission member 4 and a speaker grille 5 as shown in FIGS. 3 and 4.

  As shown in FIG. 5, the speaker 3 includes a plurality of magnets 10 and coils 11 arranged along a predetermined arrangement direction P (a direction perpendicular to the paper surface in FIG. 5). The speaker 3 includes a frame 7, a diaphragm 8 attached to the frame 7, and a yoke 9 that is elastically supported with respect to the frame 7. A plurality of magnets 10 are accommodated in the yoke 9, and a plurality of coils 11 are attached on the diaphragm 8. The diaphragm 8 is formed in a rectangular flat plate shape. The diaphragm 8 is bonded to the back surface of the frame 7 with a double-sided tape, an adhesive, or the like. The yoke 9 is made of a ferromagnetic material and is attached to an elastic member 12 (for example, a leaf spring) supported on the end of the frame 7.

  The magnets 10 are arranged so that the magnets 10 whose south poles face downward and magnets 10 whose north poles face downward are alternately adjacent. In addition, the coil 11 is arranged so as to intersect with a magnetic circuit formed by the magnets 10. Each of these coils 11 is opposed to the magnet 10 whose south pole faces downward among the plurality of magnets 10 through an opening 7 a formed in the frame 7. In the speaker 3, it is assumed that the amplitude is relatively large on one side of both sides of the diaphragm 11 of the diaphragm 8 and the amplitude is relatively small on the other side.

  As shown in FIGS. 3 and 4, the transmission member 4 is made of a resin material (for example, polycarbonate) containing glass fibers. The transmission member 4 is formed with an opening 4a for directly outputting the sound from the speaker 3 to the vehicle interior side R1, and has a frame plate shape (specifically, a rectangular frame plate shape) as a whole. The opening 4 a faces the output opening 2 a formed in the ceiling material 2 and is covered from the vehicle interior outside R 2 with the diaphragm 8 of the speaker 3. The transmission member 4 has a lateral width W1 (that is, a lateral width W1 in a direction substantially orthogonal to the arrangement direction P) and a lateral width W2 of the diaphragm 8 of the speaker 3 (that is, a lateral width W2 in a direction substantially orthogonal to the arrangement direction P). The same value (for example, about 44 mm) is set. The plate thickness t of the transmission member 4 is about 2 mm.

  The transmission member 4 is disposed between the surface of the diaphragm 8 on the vehicle interior side R1 and the surface of the ceiling member 2 on the vehicle interior outside R2. The transmission member 4 is joined to the surface of the vehicle interior outside R2 of the ceiling material 2 with an adhesive or the like. The transmission member 4 exhibits a function of transmitting the vibration of the diaphragm 8 to the ceiling material 2. The ceiling material 2 is formed by laminating a skin made of woven fabric or the like on a surface of a base material made of a resin foam or the like on the vehicle interior side.

  5 and 6, the transmission member 4 includes a pair of pieces 15a and 15b extending in a direction substantially parallel to the arrangement direction P, and end portions in the longitudinal direction of the pair of pieces 15a and 15b. A pair of contact pieces 15c and 15d for contacting is provided. Each of these pieces 15a to 15d has a slit 18 extending linearly so as to connect the outer peripheral edge 4b and the inner peripheral edge 4c of the transmission member 4 (illustrated as “fragile part” according to the present invention). Is formed. The slit 18 includes a plurality of (two in the drawing) first slits 18a formed in one piece 15a, a plurality of (two in the drawing) second slits 18b formed in the other piece 15b, A single third slit 18c formed in the connecting piece 15c and a single fourth slit 18d formed in the other connecting piece 15d. The first to fourth slits 18a to 18b divide the transmission member 4 into a plurality of (six in the drawing) regions in plan view.

  Each of the first to fourth slits 18a to 18d is notched from the outer peripheral edge 4b of the transmission member 4 and extends to the inner peripheral edge 4c. The first and second slits 18 a and 18 b extend in a direction substantially orthogonal to the arrangement direction P. The third and fourth slits 18 c and 18 d extend in a direction parallel to the arrangement direction P. Further, the interval L1 in the arrangement direction P of the adjacent first slits 18a is set to a value larger than the interval L2 in the arrangement direction P of the adjacent second slits 18b. Thereby, since the rigidity of one piece 15a is made lower than the rigidity of the other piece 15b, the resonance point is suitably shifted according to the amplitude of the diaphragm 8 of the speaker 3. The lateral width S of the first to fourth slits 18a to 18d is about 2 mm.

  As shown in FIG. 4, the inner peripheral edge 4 c of the transmission member 4 is provided with a standing wall 21 that extends toward the vehicle interior side R <b> 1 and faces or contacts the side surface of the output opening 2 a of the ceiling member 2. . This standing wall 21 is not divided by the slits 18a to 18d, and is provided over the entire circumference of the inner peripheral edge portion 4c, and has a cylindrical shape as a whole. Further, as shown in FIG. 3, an insertion port 22 into which a tongue piece described later of the speaker grill 5 is inserted is formed in the standing wall 21. Further, a small hole 23 through which a screw 26 for fastening the speaker grille 5 is inserted is formed on the opposite side of the transmission member 4 between the insertion port 22 and the opening 4a.

  As shown in FIG. 3, a projection 24 is formed on each connecting piece 15c, 15d of the transmission member 4 so as to project toward the vehicle compartment outer side R2. The speaker 3 is positioned with respect to the transmission member 4 by contacting the notches 25 formed in the frame 7 of the speaker 3 and the diaphragm 8 with the projections 24. Further, as shown in FIG. 4, a plurality of (six in FIG. 3) metal nuts 28 with which screws 27 for fastening the diaphragm 8 are engaged are embedded in the transmission member 4. These nuts 28 are insert-molded when the transmission member 4 is molded. And the speaker 3 and the transmission member 4 are integrated by screwing the screw 27 inserted in the through-hole 29 formed in the diaphragm 8 into the nut 28 of the transmission member 4.

  As shown in FIGS. 3 and 4, the speaker grill 5 is made of a resin material and is formed in a rectangular plate shape that covers the output opening 2 a of the ceiling material 2. The speaker grill 5 has a large number of through holes 31 for sound output. Further, a tongue piece 32 to be inserted into the insertion port 22 of the transmission member 4 is provided on one end side in the longitudinal direction of the speaker grill 5. Further, a boss 33 is provided on the other end side in the longitudinal direction of the speaker grill 5 so as to project toward the vehicle interior outside R2. Then, after inserting the tongue piece 32 of the speaker grill 5 into the insertion port 22 of the transmission member 4, the screw 26 inserted into the small hole 23 of the transmission member 4 is screwed into the boss 33 of the speaker grill 5, so that the ceiling material is obtained. The speaker grille 5 and the transmission member 4 are integrated with 2 therebetween.

(2) Operation of In-Vehicle Speaker Device Next, the operation of the in-vehicle speaker device 1 having the above configuration will be described. According to the speaker 3, when an audio signal (electrical signal) is input to the coil 11, a variable magnetic field is generated in the coil 11, and this variable magnetic field interacts with the magnetic field of the magnet 10 to vibrate the diaphragm 8. Further, since the magnet 10 is elastically supported with respect to the diaphragm 8, the magnet 10 also vibrates simultaneously with the vibration of the diaphragm 8. As a result, the audio signal is converted into sound. In the speaker 3, the vibration of the magnet 10 (in particular, low-frequency vibration) is propagated to the diaphragm 8 through the frame 7.

  According to the in-vehicle speaker device 1, as shown in FIG. 4, a part of the sound generated by the diaphragm 8 (especially middle and high sounds) passes through the opening 4 a of the transmission member 4 and the output opening 2 a of the ceiling material 2. It is output directly to the vehicle interior side R1. At this time, absorption of sound to the ceiling material 2 is suppressed by the standing wall 21 of the transmission member 4. Furthermore, a part of the sound (particularly low sound) generated by the diaphragm 8 is transmitted to the ceiling member 2 while being amplified by the transmission member 4 and is output to the vehicle interior side R <b> 1 by the vibration of the ceiling member 2.

(3) Effects of the Embodiment From the above, according to the vehicle-mounted speaker device 1 of the present embodiment, the vibration of the diaphragm 8 is arranged between the speaker 3 including the diaphragm 8, the diaphragm 8, and the ceiling material 2. And a frame-shaped transmission member 4 that transmits to the ceiling member 2, and the transmission member 4 is formed with slits 18 a to 18 d that extend linearly so as to connect the outer peripheral edge 4 b and the inner peripheral edge 4 c. ing. Thus, by setting the linear slits 18 a to 18 d in the transmission member 4, the resonance point of vibration is shifted in the transmission member 4 and chatter noise is reduced. Therefore, better sound can be realized in the vehicle compartment.

  In the present embodiment, slits 18a to 18d that are notched from the outer peripheral edge 4b of the transmission member 4 and extend to the inner peripheral edge 4c are employed as the fragile parts. Thereby, chatter noise is more reliably reduced by the slits 18a to 18d. In particular, in the present embodiment, the inner peripheral edge 4c of the transmission member 4 is provided with a standing wall 21 that extends toward the vehicle interior side R1 and faces or contacts the side surface of the output opening 2a formed in the ceiling member 2. However, the standing wall 21 having a sound shielding function to the ceiling material 2 is not divided by the slits 18a to 18d.

  Further, in this embodiment, the speaker 3 includes a plurality of magnets 10 and coils 11 arranged along a predetermined arrangement direction P, the transmission member 4 includes a pair of pieces 15a and 15b, and a plurality of fragile portions. The first slit 18a and the plurality of second slits 18b are provided, and the interval L1 between the adjacent first slits 18a in the arrangement direction P is different from the interval L2 between the adjacent second slits 18b in the arrangement direction P. ing. As a result, the strength differs between the pair of pieces 15a and 15b of the transmission member 4, the resonance point is suitably shifted according to the amplitude of the diaphragm 8 of the speaker 3, and chatter noise is more reliably reduced. Is done.

  In this embodiment, the transmission member 4 and the diaphragm 8 are fixed with screws 27, and nuts 28 that engage with the screws 27 are embedded in the transmission member 4. Thereby, the adhesiveness of the diaphragm 8 and the transmission member 4 is improved, and chatter noise is more reliably reduced. In particular, in this embodiment, the nut 28 is insert-molded when the resin-made transmission member 4 is molded, so that the adhesion between the diaphragm 8 and the transmission member 4 is further improved.

  Furthermore, in this embodiment, the lateral width W1 of the transmission member 4 is substantially the same as the lateral width W2 of the diaphragm 8. Thereby, the chatter noise is more reliably reduced as compared with the case where the lateral width W1 of the transmission member 4 is larger than the lateral width W2 of the diaphragm 8 (see FIG. 8A).

(4) About Experimental Example and Comparative Example Next, the sweep test results of the in-vehicle speaker device according to the experimental example and the comparative example will be described. In this sweep test (JIS C 1513), the frequency was changed from 100 to 500 Hz in 60 seconds, and the sound pressure was measured with a microphone at a position 1 meter away from the vehicle-mounted speaker device.

<Experimental Example 1 and Comparative Example 1>
As Experimental Example 1, the same one as the vehicle-mounted speaker device 1 of the above embodiment was adopted. That is, the transmission member 4 (with slits 18a to 18d, with nut 28, lateral width W1; 44 mm, plate thickness t; 2 mm) and speaker 3 (lateral width W2 of diaphragm 8; 44 mm) were employed. On the other hand, as Comparative Example 1, a modification of the in-vehicle speaker device 1 of the above-described embodiment was adopted. In other words, a modified transmission member 4 (without slits 18a to 18d, with a nut 28, lateral width W1; 44 mm, plate thickness t; 2 mm) and speaker 3 (lateral width W2 of diaphragm 8; 44 mm) was employed.

  In the sweep test result of Experimental Example 1, as shown in FIG. 7A, a straight line P1 is drawn so as to pass through a sound pressure peak at a vibration frequency of 350 Hz (a vibration frequency at which chatter noise is likely to occur). Since the sound pressures at the respective frequencies are separated from each other on the straight line P1, it can be seen that the occurrence rate of chatter noise is low. On the other hand, in the sweep test result of Comparative Example 1, as shown in FIG. 7B, a straight line P2 is drawn so as to pass the peak of the sound pressure with a frequency of 350 Hz. On the straight line P2, since the sound pressures at the respective frequencies other than the peak of the sound pressure at the frequency of 350 Hz are close to each other, it can be seen that the occurrence rate of chatter noise is high.

<Experimental Examples 2 and 3 and Comparative Example 2>
As Experimental Example 2, as shown in FIG. 8A, a modification of the vehicle-mounted speaker device 1 of the above-described embodiment was adopted. In other words, a modified transmission member 4 (with slits 18a to 18d, no nut 28, lateral width W1; 52 mm, plate thickness t; 2 mm) and speaker 3 (lateral width W2 of diaphragm 8; 44 mm) were employed. Further, as Experimental Example 3, as shown in FIG. 8B, a modification of the in-vehicle speaker device 1 of the above-described embodiment was adopted. In other words, a modified transmission member 4 (with slits 18a to 18d, no nut 28, lateral width W1; 44 mm, plate thickness t; 2 mm) and speaker 3 (lateral width W2 of diaphragm 8; 44 mm) were employed.

  Furthermore, as the comparative example 2, a modified version of the in-vehicle speaker device 1 of the above embodiment was adopted. That is, the transmission member 4 with a modified structure (no slits 18a to 18d, no nut 28, lateral width W1; 52 mm, plate thickness t; 2 mm) and speaker 3 (lateral width W2 of the diaphragm 8; 44 mm) was employed.

  In the sweep test result of Comparative Example 1, it can be seen that, in the range Q1a shown in FIG. 9A, the peak shape of each frequency appears sharply and clearly, and the occurrence rate of chatter noise is high. In contrast, in the sweep test results of Experimental Examples 2 and 3, in the ranges Q1b and Q1c shown in FIGS. Is low.

  Further, when the sweep test results of Experimental Example 2 and Experimental Example 3 are compared, in the ranges Q2b and Q2c shown in FIGS. 9B and 9C, the sound pressure of Experimental Example 3 is higher than that of Experimental Example 2 at each frequency. Is kept low. That is, when the lateral width W1 of the transmission member 4 is substantially the same as the lateral width W2 of the diaphragm 8 (Experimental Example 3; see FIG. 8B), the lateral width W1 of the transmission member 4 is larger than the lateral width W2 of the diaphragm 8. It can be seen that chatter noise is further reduced as compared with the case (Experimental Example 2; see FIG. 8A).

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the said Example, although slit 18a-18d notched from the outer periphery 4b of the transmission member 4 and extended to the inner periphery 4c was illustrated as a weak part, it is not limited to this, For example, FIG. As shown to a), it is good also as slit 18 'cut out from the inner peripheral part 4c of the transmission member 4 and extended to the outer peripheral part 4b. Further, for example, as shown in FIG. 10B, a through hole 36 penetrating in the thickness direction of the transmission member 4 without being cut out from the outer peripheral edge portion 4b and the inner peripheral edge portion 4c may be used. Further, as shown in FIG. 10C, a groove 37 that is recessed in the thickness direction of the transmission member 4 may be used. In this case, it is preferable that the groove portion 37 is formed on the surface 4e side of the vehicle interior side R1 of the transmission member 4 and the surface 4f of the vehicle interior outside R2 of the transmission member 4 is a speaker mounting surface. This is because chatter noise can be further reduced.

  Moreover, in the said Example, although the weak part (slit 18a-18d) extended linearly was illustrated, it is not limited to this, For example, as a weak part extended linearly, such as curvilinear form, curve shape, bending shape, etc. Good.

  Moreover, in the said Example, although the planar speaker 3 which vibrates the diaphragm 8 using the surface magnet 10 was employ | adopted, it is not limited to this, For example, a diaphragm is laminated | stacked between fixed electrode plates, An electrostatic flat speaker that vibrates the diaphragm by changing the voltage may be employed. Various speakers may be employed as long as the diaphragm 8 in contact with the surface of the transmission member 4 is provided.

  In the above embodiment, the screw 27 is screwed into the nut 28 embedded in the transmission member 4 and the transmission member 4 and the speaker 3 are fastened. However, the present invention is not limited to this. Instead, the transmission member 4 and the speaker 3 may be fastened by screwing the screw 27 into the female screw formed on the transmission member 4. Furthermore, in the said Example, although the nut 28 insert-molded at the time of shaping | molding of the transmission member 4 was illustrated, it is not limited to this, For example, it is good also as a nut attached after shaping | molding of the transmission member 4. FIG.

  In the above embodiment, the lateral width W1 of the transmission member 4 is substantially the same as the lateral width W2 of the diaphragm 8 of the speaker 3. However, the present invention is not limited to this, for example, the lateral width W1 of the transmission member 4 is the lateral width of the diaphragm 8. It may be larger or smaller than W1.

  Furthermore, in the said Example, although the vehicle-mounted speaker apparatus 1 attached to the vehicle ceiling material 2 (interior material) was illustrated, it is not limited to this, For example, as an interior material, a door trim, a pillar garnish, a dashboard, an instrument It is good also as a vehicle-mounted speaker apparatus attached to a panel, a console box, a sun visor, etc.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  In addition to passenger cars, buses, trucks, etc., it is widely used as a technology related to in-vehicle speaker devices that are attached to vehicle interior materials such as railway vehicles such as trains and trains, construction vehicles, agricultural vehicles, and industrial vehicles.

  DESCRIPTION OF SYMBOLS 1; Car-mounted speaker apparatus, 2; Ceiling material, 3; Speaker, 4; Transmission member, 4b; Outer peripheral edge part, 4c; Inner peripheral edge part, 7: Frame, 8: Diaphragm, 9; 11; Coil, 15a, 15b; A pair of pieces, 18a to 18d, 18 '; Slit, 27; Screw, 28; Nut, 36; Through-hole, 37; Groove, L1; First slit interval, L2; Slit spacing, P: predetermined arrangement direction, W1: width of transmission member, W2: width of diaphragm.

Claims (5)

An in-vehicle speaker device attached to a vehicle interior material,
A speaker having a diaphragm;
A frame-shaped transmission member that is arranged between the diaphragm and the interior material and transmits the vibration of the diaphragm to the interior material;
The in-vehicle speaker device characterized in that the transmitting member is formed with a weakened portion extending linearly so as to connect the outer peripheral edge portion and the inner peripheral edge portion.   The in-vehicle speaker device according to claim 1, wherein the fragile portion is a slit that is notched from one edge of the outer peripheral edge and the inner peripheral edge of the transmission member and extends to the other edge. The speaker includes a plurality of magnets and coils arranged along a predetermined arrangement direction,
The transmission member includes a pair of pieces extending in a direction substantially parallel to the arrangement direction,
The fragile portion includes a plurality of first fragile portions formed in one of the pair of pieces so as to extend in a direction substantially orthogonal to the arrangement direction, and a direction in which the other piece is substantially orthogonal to the arrangement direction. A plurality of second weakened portions formed extending to
The in-vehicle speaker device according to claim 1, wherein an interval in the arrangement direction of the adjacent first weak parts is different from an interval in the arrangement direction of the adjacent second weak parts.   The in-vehicle speaker device according to any one of claims 1 to 3, wherein the transmission member and the diaphragm are fixed with a screw, and a nut that engages with the screw is embedded in the transmission member.   The in-vehicle speaker device according to any one of claims 1 to 3, wherein a width of the transmission member is substantially the same as a width of the diaphragm.